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I nodded at this passage, Understand that what Zhang Xiaobo said is indeed reasonable, It is not a lie, Here I think it is necessary to give you one thing about popular science. So we have to say something digressive: The result of a real bullet hitting a petrol tank is not the same as that shown in most movies. One shot can explode the petrol tank, But this is not the case, Although a pure metal projectile will rub against the air at a speed of hundreds of meters per second to generate equivalent heat, And will produce sparks after hitting the metal oil drum, But none of this is enough to ignite petrol, Especially for gasoline with a large total amount, to ignite gasoline, please remember one thing-open flame must be used. In addition, gasoline is a flammable item, but it is not an explosive item in the true sense. Only after reaching a certain total amount can explosion be caused. If the total amount is insufficient, it can only cause combustion without explosion.下课铃响了，墨明拖去手套：同学们，今天的实践课就到这里，有不懂的可以自己下来继续。? ? ? ? ? 2) Build Redmine Tool for Project Management最后，返回故乡的延羽与伙伴们努力抗争，感动了故乡的人民，终于阻止了希特只要科技不要环保的破坏行为。光阴如梭，昔日的小姑娘已经出落得亭亭玉立，并成长为坚强、自信、能力超群的执法者。在同样富有天赋的搭档Tess（Nina Lisandrello）的帮助下，Catherine侦破了许多悬案，成绩令人刮目相看。但在调查最近一起谋杀案的时候，Catherine发现了一些奇怪的证据－－报告显示Vincent Keller医生（Jay Ryan）2002年丧生于阿富汗战场，但Catherine发现他还活着。不仅如此，他正是当年救她一命的恩人。出于某种神秘的原因，他过去10年被迫生活在人类社会之外，小心谨慎地守护着他的秘密－－他是一项军方秘密实验的参与者，那次实验出现严重问题，导致Vincent身体产生变异。当他被激怒的时候，会变成一种强力、敏捷、可怕、无法自我控制的怪兽。Catherine答应替Vincent保守秘密，作为交换条件，Vincent将协助Cath..船主让我用命来谢罪。In real life, China's income tax is divided into enterprise income tax, foreign-invested enterprises or foreign-invested enterprises income tax and personal income tax. For these three types of income tax, each is calculated in a different way. Personal income tax has a personal income tax calculation method, while enterprise income tax has its corresponding calculation method. If we do not adopt the policy mode to realize such a requirement, we will define an income tax class, which has an attribute to identify the type of income tax and a CalculateTax () method to calculate the tax. In this method, we need to judge the tax type and calculate the income tax for different tax types through if-else statements. Such an implementation can indeed solve this scenario, but such a design is not conducive to expansion. If the system needs to add an income tax in the later period, it has to go back and modify the CalculateTax method to add an additional judgment statement, which clearly violates the principle of "open-closed". At this time, we can consider using the strategic mode to solve this problem. Since the tax method is the changing part of this scenario, we can naturally think of abstracting the tax method at this time, which is also the essence of the implementation of the strategic mode.